I'm new to inverters so I don't know all the in's and out's technically, but I am an engineer so there are things I noticed. First, the unit seems really well built, it is heavy and feels very solid and that is a plus to me. I doubt I will ever push it to its limits but it feels like it could handle a lot. It also seems to have good customization, and allows me to have options for how it is set up, what the priority it uses, how much charge current, ect. I have kept tweaking things as I test it out. And I also really like the LCD screen and lights, always on giving me good info. I added other meters to supplement but they are not always on and the LCD is helpful. All and all I'm pleased, looks like it will meets my needs for a long time

Quality control so far is superior to most inverters on the market. Still in my own testing phase. Originally bought this for a truck camper project. But my home grid-tie with battery backup is 26 years old. (16KW) the 20 year AGM 24vdc battery cluster is now 22 years old. (I am on borrowed time) i had originally had 4kw one Trace SW4024 120 vac inverter. The AGM battery pack consisted of twelve 2 volt 1460 AH cells. They are 250 ft. From my house. (In a shielded steel building with the old inverters, solar charge controllers, wind turbine controllers etc. So this a backup to that. NEC requires ground connection and neutral to be connected at the first main circuit breaker panel. This split phase inverter says Do not connect output neutral to input neutral. Yes I tested the open voltage between input neutral and output neutral 33 vac exists between these two points. I tested with a 150 watt 120 volt conventional light bulb between both neutral and output neutral to ground .03vac. (not a problem) The low cost way around this is to isolate your main panel (now it is a sub-panel) and add a new main basic panal. (You can use a 3 phase transfer switch.) Much detail here not something the average diy should do. Your home ground goes straight to the ground rod, the neutral is bonded to ground as per NEC. I pulled the cover off to check the wiring it is the mov's & magnetics of the center tapped transformer causing the 33vac leakage voltage. (Called static or Eddy current, it goes away once your system is connected.) Just finished a full load test of 3756 watts for 2 hours every thing good so far. Closed the utility input breaker and it transferred to utility with no light flicker. Battery charger came up to charge 600 ah. Of lithium batteries!

I use it to run 220 vac mini split heat pump ac, microwave, refrigerator, computer, flat screen tv/monitor and a few other electronics I have in my truck to use while living away from home in the truck. I am currently running it off of truck batteries but eventually will run off of some lipo batteries that way I don't run truck and burn fuel. When I run truck then I charge while driving. The unit is quite heavy so imagine it has proper copper and the extras you can read for yourself in item description. Only a week or so so far but it's performance is surpassing my expectations. It's been months now and I wanted to add that I purchased a couple of lofepo4 batteries and everything is running good with the inverter. I had an issue and contacted support and they were kind enough to walk me through troubleshooting and the issue was a 60 amp breaker I used and it was too weak and made the inverter shut down repeatedly when a load was applied. Took it off and put a powerful fuse 400 amp fuse and everything works like a charm. I recommend this product, it works well. It runs my 220vac mini split for hours as well as my microwave, without a hitch. Hope this helps.

I purchased the Sun Gold Power 24V 4000W split-phase inverter/charger a few weeks ago. Today, it's going back to Amazon. It doesn't work right. The charger had a nasty habit of not completing the charge of my LiFePO4 battery bank. After several back and forth emails to Sun Gold support without resolution, and trying all kinds of different configurations with no consistent improvement, I decided enough was enough. As I was packing up the inverter for return, I noticed a shipping label on the box addressed to another customer. Was this unit purchased and returned previously?

I really do like this inverter/charger, so I'm giving it 5 stars despite my frustrations with in. I've ordered another directly from Sun Gold. I considered reordering from Amazon, but I'm wary. The picture on Amazon's page shows the unit with a black cover without a 120V outlet and remote display. The unit from Sun Gold has a blue cover and these nice features. It's the version Amazon sent me earlier, to my surprise, but would the next one be the same? Would be fresh from the factory?

I will update this review once I get the replacement and put it through testing.

UPDATE (2-5-2023) ------------------
Amazon accepted the return of the Sun Gold Power inverter/charger eight days after it delivered to their facility. I appreciate Amazon's policy of covering the return shipping charges. I decided to repurchase the unit, but this time directly from Sun Gold Power, taking advantage of a sale the company was having. I've since installed and tested the inverter/charger with the following observations:

1) It fully charges my two 100Ah 24V Ampere Time LiFePO4 batteries to 27.6 volts at an average maximum charging current of 53.4 amps.

2) The charging current varies during the fast (bulk) charging phase from 48.1 to 59.3 amps. The current variation is somewhat random which indicates a lack of control. I have a 20A 24V Ampere Time LFP battery charger which charges the batteries at a perfectly stable fast charging current.

3) The section of the Sun Gold user manual on battery charging (Section 2.5.1) which contains a diagram showing the charging profile of the charger is completely inaccurate with respect to the charging of LiFePO4 batteries (battery type setting #7 LiFePO4). At the maximum charge current setting (current adjustment knob turned fully counter clockwise), the battery is charged to 99% in the constant current charging phase (Step 1 - bulk charging). The absorption phase (indicated by a flashing amber LED) lasts for only seconds before switching to the float phase (27.6 volts). Note that LiFePO4 battery do not require a float voltage. The manual provides no mention of this charging behavior, causing much confusion. Apparently, this charger was not designed for LFP batteries, but adapted to charge them.

3) My experience reducing the charging current was not satisfactory. There were instances when the charger would not begin charging the battery when 240 AC grid voltage was restored to the SunGold's input terminals even when the battery was at a reduced state of charge. This behavior was observed in both of the units, so I suspect it's a design flaw in the electronics. I do not have this problem when charging at the maximum current setting.

4) The inverter works reliably. With a 4000 watt sustained output capacity, I have yet to exceed its output power potential. I have not been able to verify the claim of producing a "pure sine wave" power output. Under low load, I can hear tiny, short interruptions of an otherwise smooth hum from the inverter. This anomaly was noted in both Sun Gold units. The switching between bypass (charging) and inverter modes occurs without affecting electronic devices (computers, routers, TVs, etc), but some dimmed LED lights flicker slightly when powered from the inverter. This may be due to the LED control electronics. It does not happen on grid power.

This Sun Gold Power hybrid inverter is designed for off-grid solar power, or for split phase AC power when not connected to utility grid (shore) power. Charging the battery bank from solar panels is best done with a separate charge controller connecting the panels to the battery. Using the SunGold with solar micro inverters which output AC current is not normally possible because the Sun Gold inverter cannot control the power output of an AC coupled solar inverter (for example, the SMA Sunny Boy inverter or Enphase micro inverters). One has to take steps to prevent overcharging the batteries. This is unfortunate because one of the reasons for deploying an inverter/charger is to take advantage of solar generation during a prolonged utility power outage. There are inverter/chargers that are designed to control micro inverter power output (e.g., by frequency shifting), but they tend to be twice the price of the Sun Gold hybrid inverter. If this limitation can be overcome, excess solar output will be back fed to the grid through the Sun Gold in a net metering application. However, if this back feed path to the grid is lost in a grid power outage, one has to deal with any excess solar power generation to prevent overcharging the batteries.

I've reduced my rating of the Sun Gold Power inverter/charger to 4 stars for these relatively minor performance shortcomings, but if taken into account in one's use case, the inverter appears to be well made and an overall good value. I recommend it.

I have been using this for a couple of days now. I am currently using it to power 2 freezers and they are pulling about 13% of the rated capacity of the inverter according to the display. Follow the instructions before setting up your inverter. I wish that it was more than 88% efficient. It also makes a high pitch humming noise. I bought it to power two 240-volt, 12,000 BTU mini splits.